[5.x] Cleanup roles after running SitesTest@gets_authorized_sites (#11738)

Author: duncanmcclean

tests/Sites/SitesTest.php

@@ -3,6 +3,7 @@
 namespace Tests\Sites;
 
 use Illuminate\Support\Collection;
+use Illuminate\Support\Facades\File;
 use PHPUnit\Framework\Attributes\Test;
 use Statamic\Facades\Role;
 use Statamic\Facades\User;
@@ -35,6 +36,13 @@ public function setUp(): void
         ]);
     }
 
+    public function tearDown(): void
+    {
+        File::delete(resource_path('users/roles.yaml'));
+
+        parent::tearDown();
+    }
+
     #[Test]
     public function gets_all_sites()
     {